You can create WordPress websites translation projects using the WPML plugin.
After you create your website projects, translators can apply for your offer. It is up to you to select which translators to accept.
When new work is available for a recurring translation project, the approved translators are notified and they can immediately start translating any available work that exists.
If you accepted the application of more than one translator, the work will be assigned to the first translator that selects the job.